At least six Muslim youths were killed by angry Christian mobs after two churches in Nigeria were attacked at the weekend, local media reported on Monday.A suicide bomber attacked a church in Jos, a main city which sits along the fault line between the Muslim and Christian parts of the country.
Separately, gunmen sprayed bullets at a church in Biu, in Borno state. The area serves as the headquarters for Islamist group Boko Haram, widely suspected of being behind a spate of recent attacks against the government and Christians.
Several people were killed in the church attacks while dozens were injured. Police have not yet made any arrests, the local Guardian newspaper reported.
The Anglican Archbishop of Jos, Ben Kwashi, told the BBC that he condemned the church attacks and the acts of revenge. He said such "terrorism" was ruining relations between the two largest religious groups in Africa's most populous nation.
The assaults were the latest in a series targeting churches in Africa's most populous nation and largest oil producer, with many of the previous attacks also claimed by the Islamist group, whose insurgency has killed more than 1,000 people since mid-2009.
A purported spokesman for Boko Haram claimed responsibility for Sunday's attacks and threatened further violence.